The pairs method returns an iterator function that you can use with a for loop to iterate over all of the attributes contained in the JSON object.
pairs()
local myJsonObject = LuaJsonObject:new( { product="IDOL" , version=11 } )
for i, v in myJsonObject:pairs() do
print (i .. '=' .. v:string())
end
-- prints the following...
-- product=IDOL
-- version=11
_FT_HTML5_bannerTitle.htm